Hi, there.
As an experienced full-stack developer with a heavy focus on your required skills, I'm confident I can deliver the web-based multi-language code compiler you need. Over my 8-year career, I have completed numerous projects that align closely with your requirements. Some of them have a similar core functionality to yours - for instance, an online healthcare application and e-commerce websites - where the correct interpretation of the user's input, in this case, code execution and output generation, was vital.
Utilising my broad knowledge in JavaScript and Python will allow me to develop an optimal solution for you that incorporates the interactivity your project requires. Given my expertise in ReactJS and other relevant frameworks like VueJS and AngularJS, building robust front-end platforms will come naturally to me. Additionally, my experience extends beyond mere coding. My ability to integrate APIs effectively and troubleshoot existing systems ensures a comprehensive approach to development that guarantees a well-rounded end-product.
Lastly, my mastery of database functionalities like MySQL and MongoDB also solidifies me as an integral fit for your multi-language code compiler project. I have no doubt I can design a system capable of managing and retrieving data efficiently as desired. In closing, it would be a pleasure to dedicate my full time and energy to bring your project to fruition. Thank you for considering me - let's discuss this further!